3:00 a.m. in las vegas. good morning, i'm gary tuchman. >>> presidential candidates duking it out on stage again. ron paul and rick santorum involved in a heated exchange. rick perry says he would send u.s. troops back into iraq. we'll give you highlights if you missed the new hampshire debate last night. >>> plus, if you're driving while sick, one study says it's just as bad as driving while drunk. why you shouldn't get behind the wheel if you're not feeling too well. >>> and is there ever enough time in the day? we'll give you an idea about some extra time on the clock later this year. we'll explain. >>> we start with politics and the race to be the republican presidential nominee. the new hampshire primary is now just two days away, so you could have expected fireworks at last